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Division Spotlight
Human Factors, Instrumentation & Controls
Improving task performance, system reliability, system and personnel safety, efficiency, and effectiveness are the division's main objectives. Its major areas of interest include task design, procedures, training, instrument and control layout and placement, stress control, anthropometrics, psychological input, and motivation.
Meeting Spotlight
Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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Latest News
Vogtle-3 shuts down for valve issue
One of the new Vogtle units in Georgia was shut down unexpectedly on Monday last week for a valve issue that has been investigated and repaired. According to multiple local news outlets, Georgia Power reported on July 17 that unit 3 was back in service.
Southern Company spokesperson Jacob Hawkins confirmed that Vogtle-3 went off line at 9:25 p.m. on July 8 “due to lowering water levels in the steam generators caused by a valve issue on one of the three main feedwater pumps.”
G. Stange, H. Yeom, B. Semerau, K. Sridharan, M. Corradini
Nuclear Technology | Volume 182 | Number 3 | June 2013 | Pages 286-301
Technical Paper | Thermal Hydraulics | doi.org/10.13182/NT13-A16980
Articles are hosted by Taylor and Francis Online.
Pool boiling critical heat flux (CHF) measurements have been performed on stainless steel and zirconium wires in nanofluids consisting of oxide nanoparticles (7 to 250 nm) dispersed in water as well as in high-purity water after coating these wires with a variety of materials and methods. For the nanofluids study, nanoparticles of titania, alumina, zirconia, and yttria-stabilized zirconia (YSZ) were investigated for various sizes and concentrations. Results showed improvements in CHF in the range of 50% to 100%, with titania and zirconia exhibiting the highest and the lowest levels of improvement, respectively. Wires were coated separately with the same oxide nanoparticle materials, as well as pure titanium nanoparticles, using the electrophoretic deposition (EPD) technique and by nanofluid boiling. EPD coatings yielded superior and more consistent improvements in CHF values in clean water, suggesting that this could be a more practical approach than using nanofluids. Coating uniformity plays an important role in dictating the levels of CHF enhancement. In all cases, titania provided for high levels of improvement, while YSZ showed similarly high levels of improvement in some cases. Pure titanium coatings exhibited lower levels of improvement, indicating qualitatively that the lower wettability on metallic substrates (as compared to oxides) may play a role in dictating CHF improvements. Titanium, however, exhibits better adhesion to metallic substrates than do oxides, which is an important property for applications in a reactor environment. Given this, the improvements in CHF achieved by titanium coatings were sufficient to justify further study.